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In Reply to: No - I am not B/sing!!! Detailed explanation posted by jwitzsch on January 3, 2005 at 21:32:34:
check my post above. Birds have terrible high frequency hearing range. Your birds cannot hear past 12,000 KHz.Check the link I provided. Unless your "birds" are actually bats, there is no possibility they are "bothered" by ultrasonic noise.
Follow Ups:
Hisorry, did not read your answer until now - very interesting! As I said, I do have no explanation, so this was the only thing I could think of that made sense of my observations.
I'll observe them and post....
12,000 KHz should be 12,000 Hz. There must be some other explanation to what you have observed. Good Luck!
nt
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